b^2-8b-60=0

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Solution for b^2-8b-60=0 equation:


Simplifying
b2 + -8b + -60 = 0

Reorder the terms:
-60 + -8b + b2 = 0

Solving
-60 + -8b + b2 = 0

Solving for variable 'b'.

Begin completing the square.

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + -8b + 60 + b2 = 0 + 60

Reorder the terms:
-60 + 60 + -8b + b2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + -8b + b2 = 0 + 60
-8b + b2 = 0 + 60

Combine like terms: 0 + 60 = 60
-8b + b2 = 60

The b term is -8b.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8b + 16 + b2 = 60 + 16

Reorder the terms:
16 + -8b + b2 = 60 + 16

Combine like terms: 60 + 16 = 76
16 + -8b + b2 = 76

Factor a perfect square on the left side:
(b + -4)(b + -4) = 76

Calculate the square root of the right side: 8.717797887

Break this problem into two subproblems by setting 
(b + -4) equal to 8.717797887 and -8.717797887.

Subproblem 1

b + -4 = 8.717797887 Simplifying b + -4 = 8.717797887 Reorder the terms: -4 + b = 8.717797887 Solving -4 + b = 8.717797887 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + b = 8.717797887 + 4 Combine like terms: -4 + 4 = 0 0 + b = 8.717797887 + 4 b = 8.717797887 + 4 Combine like terms: 8.717797887 + 4 = 12.717797887 b = 12.717797887 Simplifying b = 12.717797887

Subproblem 2

b + -4 = -8.717797887 Simplifying b + -4 = -8.717797887 Reorder the terms: -4 + b = -8.717797887 Solving -4 + b = -8.717797887 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + b = -8.717797887 + 4 Combine like terms: -4 + 4 = 0 0 + b = -8.717797887 + 4 b = -8.717797887 + 4 Combine like terms: -8.717797887 + 4 = -4.717797887 b = -4.717797887 Simplifying b = -4.717797887

Solution

The solution to the problem is based on the solutions from the subproblems. b = {12.717797887, -4.717797887}

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